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CVE-2020-8616— BIND does not sufficiently limit the number of fetches performed when processing referrals

Quick assessment

Affected
ISC BIND9
Exploitation
High exploitation probability; assess promptly
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

ISC BIND是美国ISC公司的一套实现了DNS协议的开源软件。 ISC BIND中存在安全漏洞。远程攻击者可利用该漏洞造成拒绝服务。以下产品及版本受到影响：BIND 9.0.0版本至 9.11.18版本，9.12.0版本至 9.12.4-P2版本，9.14.0版本至 9.14.11版本，9.16.0版本至 9.16.2版本，9.17.0版本至9.17.1版本，9.13版本，9.15版本，BIND Supported Preview Edition 9.9.3-S1版本至9.11.18-S1版本。

CVSS 8.6 · High EPSS 10.59% · P96
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I. Basic Information for CVE-2020-8616

Vulnerability Information
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Vulnerability Title
BIND does not sufficiently limit the number of fetches performed when processing referrals
Source: CVE Program / CVE List V5
Vulnerability Description
A malicious actor who intentionally exploits this lack of effective limitation on the number of fetches performed when processing referrals can, through the use of specially crafted referrals, cause a recursing server to issue a very large number of fetches in an attempt to process the referral. This has at least two potential effects: The performance of the recursing server can potentially be degraded by the additional work required to perform these fetches, and The attacker can exploit this behavior to use the recursing server as a reflector in a reflection attack with a high amplification factor.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
ISC BIND 资源管理错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
ISC BIND是美国ISC公司的一套实现了DNS协议的开源软件。 ISC BIND中存在安全漏洞。远程攻击者可利用该漏洞造成拒绝服务。以下产品及版本受到影响：BIND 9.0.0版本至 9.11.18版本，9.12.0版本至 9.12.4-P2版本，9.14.0版本至 9.14.11版本，9.16.0版本至 9.16.2版本，9.17.0版本至9.17.1版本，9.13版本，9.15版本，BIND Supported Preview Edition 9.9.3-S1版本至9.11.18-S1版本。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
ISC BIND9 9.0.0 -> 9.11.18, 9.12.0 -> 9.12.4-P2, 9.14.0 -> 9.14.11, 9.16.0 -> 9.16.2, and releases 9.17.0 -> 9.17.1 of the 9.17 experimental development branch. All releases in the obsolete 9.13 and 9.15 development branches. All releases of BIND Supported Preview -

II. Public POCs for CVE-2020-8616

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III. Intelligence Information for CVE-2020-8616

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Vendor Advisories for CVE-2020-8616 (3)

Mailing List Discussions for CVE-2020-8616 (6)

Other References for CVE-2020-8616 (3)

IV. Related Vulnerabilities

Same product: BIND9
Same vendor: ISC

V. Comments for CVE-2020-8616

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